This is a 3.5X-90X zoom magnification trinocular stereo microscope head. It includes two Barlow lenses (0.5X & 2.0X), a pair of super widefield high-eyepoint 10X eyepieces and foldable eyeguards. It comes with 45-degree inclined 30mm eyetubes with diopter. Its trinocular port enables to add photo or video capability. The microscope provides sharp clear erect stereo images over a large zoom magnification range. Its super widefield optics and high-eyepoint design ensure an easy and comfortable observation. This microscope head fits all the stands with a 3" (76mm in diameter) O-ring holder.